Weight-lifting device



E. E. CHAPMAN. WEIGHT LIFTING DEVICE APPLICATION FILED JUNE 23,1920,

Q ma li. CHAPMAN. WEIGHT LIFHNG DEV-HIE, PL]

E. E. CHAPMAN. WEIGHT LIFTING DEVICE. APPLICATION FILED JUN thus be seenthat by an alternate up and down movement that the whole device isadvanced one link of the chain 11, the suspension member 19 being raiseda distance equal to the length of one pair of links of the chain 11. Toraise this hook this small amount, the operator must exert a force overconsiderable distance both up and down. If it is desired to continue themovement, the operation just described is repeated as many times asdesired.

It will be noted that by the use of the fin er 31 and the cam 40 thatthe outward an inward movement of the hooks is entirely automatic, thesehooks moving out of engagement with the chain 11 and back intoengagement following the lines of the cam 40. ,With the parts in theposition shown in full lines in Fig. 1, if it is desired to lower theweight, the operator pushes upwardly on the pipe 60 moving the partsinto the position shown in Fig. 3. It will be noted that in this figurethe hook 12 is raised out of engagement with the link 65 and it will befurther noted that the finger 31 is moved up into a position where itcan snap over and engage the lifting cam 42, the spring 32 forcing itover against the side bar 14 of the hook 13. If new the operator allowsthe pipe 60 to go downwardly by releasing his pressure thereon, the book12 is thrown outwardly by the cam 42 so that it clears the link 65 onits downward path, this hook moving downwardly until it resumes theposition shown in Fig. 2. At the middle of its travel, the finger 31reaches the inclined portion 43 of the cam 42 and the pressure of thespring 26 forces this finger downwardly against the cam 41 upon whichthe finger thereafter travels thus allowing the hook 12 to move inwardlysufiiciently to engage the link 70. The operator then pushes downwardlyon the pipe lifting the hook 13 into the position shown in Fig. 4 whichis out of engagement with the link 64, the finger 31 being then in aposition to engage the lower end of the lowering cam. 42. By diminishinghis pressure on the lever 60 the operator can now'a low the load tofall, the hook 13 being thrown out of the path 64 as it movesdownwardly. As it reaches its central position the finger 31 reaches theinterrupted portion 43 of the cam 42 and the spring 26 forces the fingerinwardly against the cam 41 upon which it then travels. This allows thefinger 13 to engage the link 65'.

During the movements just described, the weight is lowered the length ofone pair of links if" the chain and this lowering move ment may berepeated as many times as desired by repeating the cycle of operationjust described. It is thus possible for. an,

operator to either raise or lower the weight without in-any way changingthe device or upon the lowering cam and the weight may be lowered. Inpractice the operation of the device is very, rapid and is extremelysure, the method of operation being readily learned and understood byanyone.

I claim as my invention:

1. A weight lifting device comprising a suspended member havingprojections thereon, a lever to which the weight to be lifted isattached, two hooks pivoted to said lever on opposite sides of theattachment point of said weight, said hooks engaging the projections onsaid suspended member from opposite sides, spring means for forcing saidhooks toward each other, and cam means for forcing saidhooks apart todisengage them from said suspended member.

2. A weight lifting device comprising a suspended member havingprojections thereon, a lever to which the weight to be lifted isattached, two hooks pivoted to said lever on opposite sides of theattachment point of said weight, said hooks engaging the proj ections onsaid suspended member from opposite sides, and means for causing saidhooks td engage and disengage said irregularities.

3. A weight lifting device comprising a suspended member havingprojections thereon, a lever to which the weight to be lifted isattached, two hooks pivoted to said lever on opposite sides of theattachment point of said weight, said hooks enga ing the projections onsaid suspended mem r from opposite sides, spring means for forcing saidhooks toward each other, a finger secured to one of said hooks, and acam secured to the other hook, said finger pressing against said camwhich is so shaped as to force said finger to separate said hooks as itslides over said cam.

4. A weight lifting device comprising a suspended member havingprojections thereon, a lever to which the weight to be lifted isattached, two hooks pivoted to said lever on opposite sides of theattachment point of said weight, said hooks engaging the pro jections onsaid suspended member from opposite sides, spring means for forcing saidhooks toward each other, and means for throwing each of said hooks awayfrom said member as it is lifted by a movement of saiii lever about thepivot point of the other book 5. A weight lifting device comprising asuspended member having projections thereon, a lever to which the weightto be lifted it attached, two hooks pivoted to said lever means 501*forcing said bffSfi-ld linger and so formeqi tothrow said 7 i100 salternately out/01". the engagement memwith said projeciions sis/saidhbeks areliiee. nvei ezi by a meveinenfi said withou" preventing hacksfrem engage vei; poi'ni; 0f the oti r 13003;. ing said projecsions asthey are ieweied. 6. A Wei 1i; f i device eompiising a 8. A weight iiizilig device comprising 3E5 suspended member having proj e time theresuspended member having projections 'heieon, a lever which die Weight tobe 11*" 021, a lever to which the Weight to be iifteri is is abfiacheci,We hacks pivoted be said leve s'stached, two hoe pimter} 1'10 said leveron 19' mini: 0" epposi'ze sides e said Weig agile said s ngagementmember saiei lever MG '7. A WEiQ'ht ii. sus ended mam 021 a iever towhich 1 1 said projee'tiens said b005, ii-s.-Ci em; preventing said oaksfrom aid projections as t lowering en fo med a hey lowered and 7 bysaid. finger and so 59 said hooks from enis attached, two hacks ctiotnswhen at 0'1" on apposite SZCiQS of l i

